18505435199 has 2 divisors, whose sum is σ = 18505435200. Its totient is φ = 18505435198.

The previous prime is 18505435183. The next prime is 18505435241. The reversal of 18505435199 is 99153450581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18505435199 - 2⁴ = 18505435183 is a prime.

It is a super-2 number, since 2×18505435199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18505435159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252717599 + 9252717600.

It is an arithmetic number, because the mean of its divisors is an integer number (9252717600).

Almost surely, 2^18505435199 is an apocalyptic number.

18505435199 is a deficient number, since it is larger than the sum of its proper divisors (1).

18505435199 is an equidigital number, since it uses as much as digits as its factorization.

18505435199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 18505435199 in words is "eighteen billion, five hundred five million, four hundred thirty-five thousand, one hundred ninety-nine".